| 摘要 |
A screw propeller assembly comprising a propeller shaft rotatable co-axially with a swash member, a propeller having a hub connected to the propeller shaft by way of a universal joint wherein the hub is mounted to the universal joint indirectly through jointing members, the jointing members and swash plate co-operating to cause the axis of rotation of the hub to move at an incline to the axis of rotation of the propeller shaft thereby providing a paddle action to the propeller in addition to the rotary motion thereof.
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